Proton

Security and privacy

    1. Security and privacy
    2. Security and privacy
    3. Security and privacy

    The Proton Sentinel high-security program

    The Proton Sentinel program protects your account and lets you monitor login attempts with detailed logs. We explain how to use it.

    1. Proton Account
    2. Proton Account

    Help us improve Proton apps

    We explain what anonymous usage statistics you share with Proton and how they help us improve our service. We also explain how to opt out.

    1. Security and privacy
    2. Security and privacy
    3. Security and privacy

    Infrastructure and Threat Model

    Learn more about Proton Mail’s Infrastructure and Threat Model

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    Why is Proton warning me that my device’s clock is wrong?

    Proton services use the time on your device to verify that keys and signatures are still valid. This helps ensure your files stay secure.

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    Web Cryptography API

    Proton Mail requires a browser that supports the Web Cryptography API in order to secure your data. We explain what Web Crypto is.

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    Accessing onion sites in Firefox

    Proton Mail provides email access over the Tor network through our onion site at https://protonirockerxow.onion. If you are connected to Tor and using Firefox, there is another step you may have to follow to be able to access onion sites.

    1. Browsers and cookies
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    How to setup encrypted email over Tor

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    Connection is Not Secure Warning

    1. Browsers and cookies
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    Turn off Private Browsing (iOS Safari)

    Learn how to turn Private Browsing on and off in iOS Safari. Private Browsing can block cookies that are needed to implement Proton Mail's encryption.

    1. Browsers and cookies
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    How to clean cache and cookies

    Both the browser cache and cookies can cause minor issues when using Proton Mail. In this article, we show you how to clean them in all major browsers.

    1. Browsers and cookies
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    How to enable JavaScript

    JavaScript must be enabled in your browser for Proton Mail to work correctly,. In this article, we show you how to enable JavaScript in all major browsers.

    1. Browsers and cookies
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    How to enable cookies

    One of the requirements for using Proton Mail on some browser is enabling cookies. Learn how to enable cookies for easy usage of Proton Mail

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    Why do you need JavaScript, sessionStorage, and cookies?

    Proton Mail and Proton VPN require JavaScript, sessionStorage, and cookies to ensure the security and privacy of your data.

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    How to access Proton Mail in Private Browsing (Incognito) mode

    Learn how to use Private Browsing (also known as Incognito) mode in your browser to access Proton Mail more privately.

    1. Browsers and cookies
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    PRNG

    Proton Mail generates random numbers in several places to secure your account. Learn why you need PRNG to use Proton Mail.

    1. Browsers and cookies
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    Recommended browsers

    Proton Mail has been fully tested and works well with most modern browsers. But we only recommend browsers that also respect your privacy.

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    Proton Mail’s TLS/SSL Certificate

    Proton Mail uses Let's Encrypt as its certificate authority. This article describes the steps to verify our certificate for various browsers.

    1. Browsers and cookies
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    Screen not loading in iPhone (iOS) (“Absolute Security – requires modern web browser”)

    Troubleshooting errors using Proton Mail in iOS browsers (Safari, etc)

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    Allowing sessionStorage

    Allowing session storage on most used browsers Chrome, Firefox, Safari, IE

    1. Encryption and keys
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    What is Key Transparency?

    Key Transparency is an advanced blockchain-based security feature that lets you verify the integrity and authenticity of your Proton Mail contacts.

    1. Encryption and keys
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    Importing OpenPGP private keys into Proton Mail

    You can use import your existing OpenPGP private key into Proton Mail and continue using it to encrypt and decrypt your emails.

    1. Encryption and keys
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    Security requirements and recommendations for OpenPGP keys

    To keep your messages safe, Proton Mail will not allow you to import weak keys or keys that have not been standardized for use with OpenPGP.

    1. Encryption and keys
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    How to upload your backup private keys

    Key import allows you to add existing PGP keys to one of your Proton Mail addresses or restore backed-up keys if you lose your password.

    1. Encryption and keys
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    How to create new encryption keys

    Proton Mail allows you to choose which kind of encryption keys to use for your accounts. Learn how to change your encryption keys.

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    Key management

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    How to download your public and private keys

    Learn how to download your encryption keys from Proton Mail to send PGP-encrypted emails to non-Proton Mail users or use another PGP client.

    1. Encryption and keys
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    How is the private key stored?

    Proton Mail private key is stored encrypted on your browser using your mailbox password. Learn more about your private key.

    1. Mobile security
    2. Mobile security
    3. Mobile security
    4. Mobile security

    Android Keystore issues

    Proton apps on Android use the Android Keystore system to encrypt your passphrase, but on less than 1% of devices there is an issue.

    1. Mobile security
    2. Mobile security
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    How to use the auto-lock feature on Android

    Set your Proton Mail Android app to automatically lock with a pin code

    1. Mobile security
    2. Mobile security
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    How to set up Face ID, Touch ID, and PIN code lock on the Proton Mail iOS app

    Learn how to set Proton Mail on your iPhone to lock automatically with Face ID, Touch ID, or PIN code lock.

    1. Mobile security
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    Finding the version number of your Android or iOS device

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